Numerical investigation of 3-D transient combusting flow in a 1.2MWth pilot power plant

Nikolopoulos, A; Rampidis, I; Nikolopoulos, N; Grammelis, P; Kakaras, E

dc.contributor.author	Nikolopoulos, A	en
dc.contributor.author	Rampidis, I	en
dc.contributor.author	Nikolopoulos, N	en
dc.contributor.author	Grammelis, P	en
dc.contributor.author	Kakaras, E	en
dc.date.accessioned	2014-03-01T02:52:05Z
dc.date.available	2014-03-01T02:52:05Z
dc.date.issued	2009	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35829
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-75149154349&partnerID=40&md5=fe7c746a0f0dd6172df06c16bcc40c4c	en
dc.subject	CFBC	en
dc.subject	CFD	en
dc.subject	Combustion mechanisms	en
dc.subject	Euler approach	en
dc.subject.other	CFD analysis	en
dc.subject.other	CFD models	en
dc.subject.other	Chemical component	en
dc.subject.other	Chemical phenomenas	en
dc.subject.other	Circulating fluidized bed combustor	en
dc.subject.other	Closure equations	en
dc.subject.other	Combusting flow	en
dc.subject.other	Combustion mechanism	en
dc.subject.other	Comprehensive model	en
dc.subject.other	Comprehensive modeling	en
dc.subject.other	Computational costs	en
dc.subject.other	Euler approach	en
dc.subject.other	Eulerian	en
dc.subject.other	Formation mechanism	en
dc.subject.other	Isothermal models	en
dc.subject.other	Numerical investigations	en
dc.subject.other	Operating problems	en
dc.subject.other	Pilot power	en
dc.subject.other	Time uncertainty	en
dc.subject.other	Computational efficiency	en
dc.subject.other	Computational fluid dynamics	en
dc.subject.other	Differential equations	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Fluidization	en
dc.subject.other	Fluidized bed combustors	en
dc.subject.other	Fluidized bed process	en
dc.subject.other	Fluidized beds	en
dc.subject.other	Hydrodynamics	en
dc.subject.other	Inert gases	en
dc.subject.other	Pilot plants	en
dc.subject.other	Plant shutdowns	en
dc.subject.other	Smoke	en
dc.subject.other	Three dimensional	en
dc.subject.other	Fluidized bed combustion	en
dc.title	Numerical investigation of 3-D transient combusting flow in a 1.2MWth pilot power plant	en
heal.type	conferenceItem	en
heal.publicationDate	2009	en
heal.abstract	As industrial Circulating Fluidized bed Combustors (CFBCs) tend to be scaled up, numerous design and operating problems emerge. At the same time uncertainties which concern hydrodynamics, combustion and pollutants formation mechanisms, come in to sight. Along with experience, CFD analysis can play crucial role providing further insight on the complex multiphase combusting flow occurring in CFBCs. This work aims to present a methodology for CFBCs comprehensive modeling, taking into consideration the coupling of hydrodynamics - heat transfer - chemical phenomena that take place in the bed. A combination of acceptable accuracy with high computational efficiency was also an objective. For this purpose, a simple combustion mechanism was integrated in an isothermal model and applied on a 1.2 MWth pilot plant. In this comprehensive model gas, inert-material and fuel are taken into consideration, as three discrete, pure eulerian phases. Solids inventory in the riser as well as temperature of the bed were predicted with satisfactory accuracy. Moreover, major chemical components as O2 and CO2 concentrations were predicted along the bed with acceptable accuracy. Concluding, the developed CFD model is capable of efficiently modeling a CFBC. However in order to further increase total accuracy, the need for improved closure equations for the set of Partial Differential Equations solved was made obvious. Finally, the computational cost for such modeling was found extremely high but not prohibitive for large scale CFBC simulations.	en
heal.journalName	Proceedings of the 20th International Conference on Fluidized Bed Combustion	en
dc.identifier.spage	839	en
dc.identifier.epage	844	en